# Cloudmersive, free: Email verification API

> Eliminate bounced emails. With these APIs, you can validate whether an email is real when you accept it. Our function fully verifies the existence of the email address with the email server, without sending any emails to the customer.

Cloudmersive's email verification API on its Free Tier plan. It costs $0.00 per 1,000 emails. It returns 2 of the 6 key fields we check: Deliverability, Company.
We rank 2,467 plans by price. [treg's top-up from $10](https://datacircle.dev/validate-email-apis/treg/top-up-from-10/llms.txt) costs the least per 1,000 emails: $0.00 on average. treg asks one provider after another until one answers. You pay $26.95 per 1,000 emails when no provider answers.
[Enrich.so](https://datacircle.dev/validate-email-apis/enrich-so/149-monthly/llms.txt), [GetProspect](https://datacircle.dev/validate-email-apis/getprospect/369-pack/llms.txt) and [treg](https://datacircle.dev/validate-email-apis/treg/top-up-from-10/llms.txt) are the best email verification API providers in our benchmark.

- This page: https://datacircle.dev/validate-email-apis/cloudmersive/free
- [Best email verification API in 2026](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://cloudmersive.com/pricing-small-business
- Request: `POST https://api.cloudmersive.com/validate/email/address/full`
- API key: with the plan, on https://cloudmersive.com/pricing-small-business
- Its API docs: https://api.cloudmersive.com/docs/validate.asp
- Sold by: Cloudmersive (https://cloudmersive.com)
- Checked: 2026-10-27

## In the answer

- Completeness: 33%
- Deliverability: ✓
- Company: ✓

## Price

- $ per 1,000 emails: $0.00
- Per: call
- Billing: free

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: 543 other calls

## Not found

- $ per 1,000: $0.00

## Catch-all

- $ per 1,000: $0.00

## In their words

- Their pitch: Eliminate bounced emails. With these APIs, you can validate whether an email is real when you accept it. Our function fully verifies the existence of the email address with the email server, without sending any emails to the customer.

## Data

- Freshness: live
- What it checks: format, mail servers, disposable domains, mailbox
- Keep data: no limit
- Use data: When using the APIs, you may not (or allow those acting on your behalf to): Sublicense an API for use by a third party. Consequently, you will not create an API Client that functions substantially the same as the APIs and offer it for use by third parties. [...] Reverse engineer or attempt to extract the source code from any API or any related software, except to the extent that this restriction is expressly prohibited by applicable law. [...] Perform load testing on Cloudmersive services. Perform penetration testing on Cloudmersive services. [...] You will comply with all applicable privacy laws and regulations including those applying to PII. [...] You agree to comply with all applicable laws, regulations, and third-party rights, including without limitation those relating to data privacy, intellectual property, export controls, and AI regulatory requirements. [...] You shall not use the APIs to monitor or measure availability, performance, accuracy, or functionality for benchmarking or competitive analysis, and you shall not publish, disclose, or otherwise make available any results of benchmark, performance, or evaluation testing of the APIs without Cloudmersive's prior written consent.

## Plan

- Pay: $0
- You get: 600 requests a month
- Enough for: 600 calls a month

## Rate limit

- Per second: 1
- Concurrent: 1
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: email
- Method: POST
- Path: /validate/email/address/full

## About the plan

- Plan: Free Tier
- Who can get it: anyone

## The 9 fields the plan's answer can hold

valid address, mail server, valid syntax, valid domain, valid SMTP, catch-all, domain, free, disposable

## Cloudmersive's plans (31)

- [Cloudmersive, free](https://datacircle.dev/validate-email-apis/cloudmersive/free/llms.txt): $0.00 per 1,000, 33% complete, live
- [Cloudmersive, $19.99 monthly](https://datacircle.dev/validate-email-apis/cloudmersive/19-99-monthly/llms.txt): $1.999 per 1,000, 33% complete, live
- [Cloudmersive, $49.99 monthly](https://datacircle.dev/validate-email-apis/cloudmersive/49-99-monthly/llms.txt): $1.9996 per 1,000, 33% complete, live
- [Cloudmersive, $99.99 monthly](https://datacircle.dev/validate-email-apis/cloudmersive/99-99-monthly/llms.txt): $1.9998 per 1,000, 33% complete, live
- [Cloudmersive, $199.99 monthly](https://datacircle.dev/validate-email-apis/cloudmersive/199-99-monthly/llms.txt): $1.9999 per 1,000, 33% complete, live
- [Cloudmersive, $499.99 monthly](https://datacircle.dev/validate-email-apis/cloudmersive/499-99-monthly/llms.txt): $2.00 per 1,000, 33% complete, live
- [Cloudmersive, $1,499.99 monthly](https://datacircle.dev/validate-email-apis/cloudmersive/1499-99-monthly/llms.txt): $2.00 per 1,000, 33% complete, live
- [Cloudmersive, $1,999.99 monthly](https://datacircle.dev/validate-email-apis/cloudmersive/1999-99-monthly/llms.txt): $2.00 per 1,000, 33% complete, live
- [Cloudmersive, $239.88 yearly](https://datacircle.dev/validate-email-apis/cloudmersive/239-88-yearly/llms.txt): $1.999 per 1,000, 33% complete, live
- [Cloudmersive, $599.88 yearly](https://datacircle.dev/validate-email-apis/cloudmersive/599-88-yearly/llms.txt): $1.9996 per 1,000, 33% complete, live
- [Cloudmersive, contact us, Medium Business Premier](https://datacircle.dev/validate-email-apis/cloudmersive/contact-us-medium-business-premier/llms.txt): 33% complete, live
- [Cloudmersive, contact us, Medium Business Advantage](https://datacircle.dev/validate-email-apis/cloudmersive/contact-us-medium-business-advantage/llms.txt): 33% complete, live
- [Cloudmersive, contact us, Enterprise](https://datacircle.dev/validate-email-apis/cloudmersive/contact-us-enterprise/llms.txt): 33% complete, live
- [Cloudmersive, contact us, Managed Instance D2.Medium](https://datacircle.dev/validate-email-apis/cloudmersive/contact-us-managed-instance-d2-medium/llms.txt): 33% complete, live
- [Cloudmersive, contact us, Managed Instance D2.Small](https://datacircle.dev/validate-email-apis/cloudmersive/contact-us-managed-instance-d2-small/llms.txt): 33% complete, live
- [Cloudmersive, contact us, Managed Instance D4.Large](https://datacircle.dev/validate-email-apis/cloudmersive/contact-us-managed-instance-d4-large/llms.txt): 33% complete, live
- [Cloudmersive, contact us, Managed Instance E2.Large](https://datacircle.dev/validate-email-apis/cloudmersive/contact-us-managed-instance-e2-large/llms.txt): 33% complete, live
- [Cloudmersive, contact us, Managed Instance E2.Medium](https://datacircle.dev/validate-email-apis/cloudmersive/contact-us-managed-instance-e2-medium/llms.txt): 33% complete, live
- [Cloudmersive, contact us, Managed Instance E2.XLarge](https://datacircle.dev/validate-email-apis/cloudmersive/contact-us-managed-instance-e2-xlarge/llms.txt): 33% complete, live
- [Cloudmersive, contact us, Managed Instance G2.Large](https://datacircle.dev/validate-email-apis/cloudmersive/contact-us-managed-instance-g2-large/llms.txt): 33% complete, live
- [Cloudmersive, contact us, Managed Instance G2.Medium](https://datacircle.dev/validate-email-apis/cloudmersive/contact-us-managed-instance-g2-medium/llms.txt): 33% complete, live
- [Cloudmersive, contact us, Managed Instance G2.XLarge](https://datacircle.dev/validate-email-apis/cloudmersive/contact-us-managed-instance-g2-xlarge/llms.txt): 33% complete, live
- [Cloudmersive, contact us, On-Premises 1VC](https://datacircle.dev/validate-email-apis/cloudmersive/contact-us-on-premises-1vc/llms.txt): 33% complete, live
- [Cloudmersive, contact us, On-Premises 2EVC](https://datacircle.dev/validate-email-apis/cloudmersive/contact-us-on-premises-2evc/llms.txt): 33% complete, live
- [Cloudmersive, contact us, On-Premises 2EVC (Government)](https://datacircle.dev/validate-email-apis/cloudmersive/contact-us-on-premises-2evc-government/llms.txt): 33% complete, live
- [Cloudmersive, contact us, On-Premises 2VC](https://datacircle.dev/validate-email-apis/cloudmersive/contact-us-on-premises-2vc/llms.txt): 33% complete, live
- [Cloudmersive, contact us, On-Premises 4EVC](https://datacircle.dev/validate-email-apis/cloudmersive/contact-us-on-premises-4evc/llms.txt): 33% complete, live
- [Cloudmersive, contact us, On-Premises 4EVC (Government)](https://datacircle.dev/validate-email-apis/cloudmersive/contact-us-on-premises-4evc-government/llms.txt): 33% complete, live
- [Cloudmersive, contact us, On-Premises 4VC](https://datacircle.dev/validate-email-apis/cloudmersive/contact-us-on-premises-4vc/llms.txt): 33% complete, live
- [Cloudmersive, contact us, On-Premises 8EVC](https://datacircle.dev/validate-email-apis/cloudmersive/contact-us-on-premises-8evc/llms.txt): 33% complete, live
- [Cloudmersive, contact us, On-Premises 8EVC (Government)](https://datacircle.dev/validate-email-apis/cloudmersive/contact-us-on-premises-8evc-government/llms.txt): 33% complete, live

## Cloudmersive's calls for this API (1)

- `POST /validate/email/address/full`: [Cloudmersive, free](https://datacircle.dev/validate-email-apis/cloudmersive/free/llms.txt)

## Cloudmersive's APIs (2)

- [Cloudmersive: email verification API pricing, 31 plans](https://datacircle.dev/validate-email-apis/cloudmersive/free/llms.txt)
- [Cloudmersive: phone validation API pricing, 31 plans](https://datacircle.dev/validate-phone-apis/cloudmersive/free/llms.txt)

## Cloudmersive: email verification API alternatives

- [ZeroBounce, $23,988 yearly, ZeroBounce ONE annually, 1,000,000 credits a month, POST /v2/validatebatch](https://datacircle.dev/validate-email-apis/zerobounce/23988-yearly-zerobounce-one-annually-1000000-credits-a-month-post-v2-validatebatch/llms.txt): $1.999 per 1,000, 83% complete, live
- [Verimail, $20 pack](https://datacircle.dev/validate-email-apis/verimail/20-pack/llms.txt): $2.00 per 1,000, 50% complete, live
- [MillionPhones, $60 monthly](https://datacircle.dev/validate-email-apis/millionphones/60-monthly/llms.txt): $2.00 per 1,000, 33% complete, live
- [Verifly, $10 pack, Starter, POST /verify/bulk](https://datacircle.dev/validate-email-apis/verifly/10-pack-starter-post-verify-bulk/llms.txt): $2.00 per 1,000, 33% complete, live

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-10-27.

- https://api.cloudmersive.com/docs/validate.asp
- https://cloudmersive.com/email-verification-api
- https://cloudmersive.com/pricing
- https://cloudmersive.com/pricing-small-business
- https://cloudmersive.com/validate-api
- https://portal.cloudmersive.com/terms-of-service.aspx